Portaloo????

Go outdoors sell these plastic buckets with a hinged toilet seat below the lid:

The advertising blurb on the label says:

• sturdy and lightweight plastic bucket with carry handle
• snap on toilet seat
• suitable for use with toilet bags and/or toilet chemicals

and on the other side of the label is a picture of three intrepid hikers in the hills/mountains

I wonder how they decided which of them got to carry it...can you see it peeking out of the top of a rucksack anywhere?